资料介绍
摘要： 显示的精度当前镜像允许您要变换的一种类型的 4–20mA 发射机到另一个，或创建直放站延长当前循环的目的。电路包括一个输入接收器输出接收器的镜子和一个输入源输出源的镜子。
Maxim > App Notes > Amplifier and Comparator Circuits Circuit Protection
Keywords: constant-power drivers, resistive loads, chopped-DC drive, op amps, analog multipliers, current-sense amplifiers Nov 29, 2010
APPLICATION NOTE 4523
Constant-Power Driver Is Simple, Efficient, and Inexpensive
Abstract:A combination current-sense amplifier and multiplier (MAX4211F) senses both the current through and voltage across
the load, and supplies at one of its outputs (POUT) a voltage proportional to the continuous product of those variables, i.e.,
proportional to the load's instantaneous power. External op amps generate a corresponding PWM (pulse width modulated) output
signal that controls a p-channel MOSFET in series with the load.
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